servers/vfs/timers.c

   1 /* FS timers library
   2  */
   3
   4 #include "fs.h"
   5
   6 #include <timers.h>
   7 #include <minix/syslib.h>
   8 #include <minix/com.h>
   9
  10 PRIVATE timer_t *fs_timers = NULL;
  11
  12 PUBLIC void fs_set_timer(timer_t *tp, int ticks, tmr_func_t watchdog, int arg)
  13 {
  14         int r;
  15         clock_t now, old_head = 0, new_head;
  16
  17         if ((r = getuptime(&now)) != OK)
  18                 panic(__FILE__, "FS couldn't get uptime from system task.", NO_NUM);
  19
  20         tmr_arg(tp)->ta_int = arg;
  21
  22         old_head = tmrs_settimer(&fs_timers, tp, now+ticks, watchdog, &new_head);
  23
  24         /* reschedule our synchronous alarm if necessary */
  25         if (!old_head || old_head > new_head) {
  26                 if (sys_setalarm(new_head, 1) != OK)
  27                         panic(__FILE__, "FS set timer "
  28                         "couldn't set synchronous alarm.", NO_NUM);
  29         }
  30
  31         return;
  32 }
  33
  34 PUBLIC void fs_expire_timers(clock_t now)
  35 {
  36         clock_t new_head;
  37         tmrs_exptimers(&fs_timers, now, &new_head);
  38         if (new_head > 0) {
  39                 if (sys_setalarm(new_head, 1) != OK)
  40                         panic(__FILE__, "FS expire timer couldn't set "
  41                                 "synchronous alarm.", NO_NUM);
  42         }
  43 }
  44
  45 PUBLIC void fs_init_timer(timer_t *tp)
  46 {
  47         tmr_inittimer(tp);
  48 }
  49
  50 PUBLIC void fs_cancel_timer(timer_t *tp)
  51 {
  52         clock_t new_head, old_head;
  53         old_head = tmrs_clrtimer(&fs_timers, tp, &new_head);
  54
  55         /* if the earliest timer has been removed, we have to set
  56          * the synalarm to the next timer, or cancel the synalarm
  57          * altogether if th last time has been cancelled (new_head
  58          * will be 0 then).
  59          */
  60         if (old_head < new_head || !new_head) {
  61                 if (sys_setalarm(new_head, 1) != OK)
  62                         panic(__FILE__,
  63                         "FS expire timer couldn't set synchronous alarm.",
  64                                  NO_NUM);
  65         }
  66 }